If most single-player campaigns in online shooters are designed to get your feet wet before throwing you into the pool with other players, Splatoon 2’s Octo Expansion is designed to throw you into the intimidating deep end. Many of its cleverly designed levels are not afraid to ask for a certain level of skill as they test you in more than just combat scenarios; some demand precise platforming or evasion against overwhelming odds, while others tease your brain to manipulate the environment and guide vulnerable objects to a goal. The sheer variety and difficulty of challenges, encased in a somber and grimy take on Splatoon’s world, leads to a single-player experience that rarely pulls its punches.
Source: IGN.com Splatoon 2: Octo Expansion DLC Review